Example from Manhattan book:
Wrong: Stacy would have gone to the party if she knew about it
Correct: Stacy would have gone to the party if she had known about it
The phrase if she knew about it
is wrong because it conveys the meaning that perhaps Stacy DID know about the party.
How come the phrase "if she knew about it" convey that she probably did know about the party?
even though i'd agree the second sentence sounds better but I'm really not able to connect to the reasoning behind it. Please help me understand it better.